Economical environment-friendly regenerated steel-fiber-reinforced ultra-high-performance concrete and preparation method
An ultra-high performance, concrete technology, applied in the field of concrete, can solve the problems of poor deformation performance and obvious brittle characteristics, and achieve the effects of increasing toughness and fracture resistance, improving deformation ability and increasing strength
Active Publication Date: 2017-08-01
BEIJING UNIV OF TECH
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Problems solved by technology
Although UHPC without steel fiber has high strength and dense microstructure, it has poor deformation performance and significant brittle characteristics. Therefore, fiber is an indispensable reinforcement material for the preparation of ultra-high performance concrete.
Method used
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[0023] Below in conjunction with example the present invention will be further described, but the present invention is not limited to following example.
[0024] Examples 2, 3, 4, and 6 are examples, and examples 1, 5, and 7 are comparative examples.
[0025] The typical material proportions adopted in each embodiment and comparative example are listed in Table 1.
[0026] Table 1 Example material mix ratio
[0027]
[0028] The materials used in the above table are described as follows:
[0029] The ordinary cement used has a specific surface area of 350m 2 / kg of PO.42.5 Ordinary Portland Cement.
[0030] The superfine cement used has a specific surface area of 650m 2 / kg of 52.5 grade expansive superfine cement.
[0031] The grade of blast furnace slag used is S95, with a density of 2.86g / cm 3 , specific surface area 408m 2 / kg.
[0032] The sand used is natural quartz sand with a particle size ranging from 0.2 to 0.4 mm.
[0033] The water used complies wit...
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Abstract
The invention discloses economical environment-friendly regenerated steel-fiber-reinforced ultra-high-performance concrete and a preparation method and belongs to the technical field of concrete. The economical environment-friendly regenerated steel-fiber-reinforced ultra-high-performance concrete is prepared from the raw materials of cement, superfine active powder, admixture, sand, water, high-efficiency water reducing agent, ecological steel fiber and protogene steel fiber. The mass ratio of total cementing material weight to the sand to the water to the water reducing agent is 1 : (0.7 to 1.5) : (0.14 to 0.2) : (0.01 to 0.05), and the cement, the superfine active powder and the admixture occupy 16% to 24%, 8% to 12% and 16% to 24% of total normal concrete weight. The ecological steel fiber is prepared from any form of waste steel wires which are processed again. In a preparation process, the cementing material and the sand in the required raw materials are poured into a stirring machine to be evenly stirred, then the water reducing agent and the water are slowly poured into the stirring machine, the steel fiber is manually added until mixture is changed into a colloidal state from a particle state, and the concrete is poured after the steel fiber is evenly dispersed. The preparation method disclosed by the invention can reduce preparation cost of the ultra-high-performance concrete.
Description
technical field [0001] The invention relates to an economical and environment-friendly recycled steel fiber ultra-high performance concrete and a preparation method thereof, which belong to the technical field of concrete and are mainly used in concrete engineering structures that require high strength, toughness, and crack resistance, such as bridges, railways, and highways. , high-rise buildings, long-span space structures, repair and reinforcement, tunnels, pipelines, crane beams and other prefabricated components, military engineering, etc. Background technique [0002] In the French Bougygues laboratory in the 1990s, Richard P and others successfully developed a new type of composite material - reactive powder concrete (Reactive Powder Concrete) using ordinary cement, silica fume, quartz sand, high-efficiency water reducing agent, and steel fiber. Powder Concrete (RPC for short), commonly referred to as Ultra High Performance Concrete (UHPC for short) in Europe, uses si...
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IPC IPC(8): C04B28/04C04B14/48
CPCC04B28/04C04B2201/52C04B7/00C04B18/141C04B14/06C04B2103/302C04B14/48C04B40/0028C04B40/0295C04B40/04
Inventor 邓宗才王辉
Owner BEIJING UNIV OF TECH